the equivalent parasitic capacitance of both windings,
Rz represents the loss power in the ferromagnetic core, Lh is
the main inductance of the transformer, Lr1 and L
r2 are the
leakage inductances of the primary and secondary side, and
Z
2 is the load of the transformer referred to the primary side.
This replacement is valid only for a transformer ratio 1:1.
For other ratios, the values of the secondary voltage U2 and
current I2 of the transformer must be recalculated according
to the well-known formulas: